You can classify a triangle, a three-sided polygon, two different ways--by its angles or by its sides. Click on the slideshow below to find out more.
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BY SIDES A triangle that has three equal sides is called an equilateral triangle.
BY SIDES A triangle with two equal sides is called an isosceles triangle.
BY SIDES A scalene triangle is a triangle that has no sides of equal length.
BY ANGLES A triangle is an acute triangle when the measures of all three angles are acute.
BY ANGLES A triangle is an obtuse triangle when it has one obtuse angle.
BY ANGLES A triangle is called a right triangle when it has one right angle.
BY ANGLES A triangle is called an equiangular triangle when the measures of all its angles are congruent.
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